Living in the Phoenix area I can attest to dealing with heat, I have had shoe soles melt while on the pavement, gotten blisters on the backs of my legs from sitting down on a leather car seat, had CDs melt while in the car radio. My suggestion is the same as Copperheid, lots of water to keep the sweat glands working and pray for a breeze.

In the summer it is 110 inside the shop at my toolbox, outside in the shade 118 is not uncommon. I drink around 2 gallons of water per day to keep from burning up